How Differential Gear works (BEST Tutorial)

An excellent tutorial from the 1930's on the principles and development of the Differential Gear. Fast Forward to 1:50 if you want to skip the intro.

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Gear Cutting Basics and Cutting Pinion Gears on a Horizontal Mill
This video starts out with a discussion of what information you need to
know before starting to cut gears and some formulas you can use to
calculate dimensions you will need. Next, we set up the horizontal mill
for gear cutting using a dividing head and then cut some pinion gears. We
also discuss some inspection methods such as measuring over pins.

How a Differential works ?
Working of a differential is explained in a logical and illustrative
manner in this animated video. Differential helps in turning the drive
wheels at different rpm while the vehicle is taking a turn.